Transmission device



Jan,- 13, 1925.

R. GIRARDELLI TRANSMISSON DEVICE Filed May 5, 1920 Patented dan. i3, i925..

Unirse srArE-s 'RCCARDO GIRARDELLL' 40E" ROME, ZETAILL'SZ'.4

"TRANSMISSION\ DEVICE.

`.Lippli'cations IedvB/Iay 3,r 1920,`

To/aZZ-/whom t may concern.:

Be it known that I, RrocARno GIRARDELLr, a1 subjectv of the Kingot ltaly,` residing at Rome, .in thev .Kingdom yofitaly, haver invented certainnew and* usetful Improve-Y ments? in Transmission gDevices,k of which the following is a specifica-tion..

Iti happens often thatqin. thetransmission of ,angularf. movements rom .Y a controifling stationtof several distanti points where` the controlled-.stations are located-as it isthe case-.for instance inthe control of gun tire or;4 searchflighlts, and the ,like-the angles oiwirotationtto bewtransmitted tothe dit- :t'erentreceiving ystations have dierent vvalues lvariabie according tothe relative positions of the receiving stationssandthe con-trolling f apparatus.

i'lihe` ,ordinaryv methods tor the transmis sionfot: angie-ilary movements would require innsuoh cases. either .to correct severally the angles.l transmitted tofeach of the receiving; stations, orv the use ,ot asvmany trans mission apparatus .i asy there are stations f or groups of stations, :which must .receive dit'- ,terent' angles.

Thezobject ot thepres'ent invention is to Aovercome said difculty by theuse of arsingle-.transmitting apparatus which, by asingle" movement imparted to` it, transmits at'thev same timepdifterent angles to the various receiving stations.

.Inorder' to secure the aforesaidr result the transmitting apparatus according to .the present invention'comprises a set of elementary devices moved together by; a single movement and, Veach oner of which transmits to the station, or tothe group ot receiving stations controlled by the same, the angle impressed to the transmit-ter corrected `in the required manner.

. In vthe dra-wing annexed herewith, which serves to illustrate diagrammatically a manner of carrying into practice the presr ent invention Fig. l shows ay front view of the apparat'uswith the casing removed;

Figure 2 is a top view ot one of the elements of the transmitting device;

Fig; 3 shows an arrangement for varying the law of transmission of the device according to Figs. 1 and 2;

Fig. 4 shows a side view of at group ot said elements.

SeralwNo. 378,638:

The apparatusvcomprises substantially.asv

many toothed discs 1e- (Fig. l)l as there are stations. Thesel discs being arranged. onel above ther, other are supportedbyf the.- lateral expansions AC1- of atubulanpivot -osupported in its turn.laygra.sta'Giona-ry;y 60

base--40-. The discs- 1 arerprovided with diametrically` opposite holes 4=2`for the passa-ge of rods` -..-i-3` designed; to. con..- nect saiddiscs withaeach. other,vwhichldiscs are arrangedi eccentrically, in respect.i of, the A 0 of the hollow pivot The eccentricity let `the idiscs in respect otsaid. axis may betvaried, as twill` be f explained herein-after, by .means ,ot ya rod fil- Vapt to. shittthfem-laterallyin. "m

respect or the Yaxis -ro o l. The openings +42- are shaped inusualesl way as to perm-it; said 'sliittin-gs,the` axis bf the rod --ll--Y beingin alignment-with theaxis or the tubular pivot-M21 Saidirod; is ab'lefto shiftin the tubular ,pivotffgnided byv the-expansions 'lilhe eccentric-ity is 4determined in `relation to the interval lll.

existing' between.` the various. stations, 2said eccentricity being `variable in lfunction for the distance by means of a cam capablejof shiftingithe. rodv -vliupward or 'downward. yEachcdisc -l--y has. a collare-4- Fig. 2) revolving 4.upon `the, disc by.- means ofa. worm f8-@capable of meshing with teeth on the periphery ofathe: disc. The whole device is enclosed in: a frame f2- revolving around the axis -0-. The upper portion of thisl frame carries the sighting telescope which turns with the samel aboutv pivot -0-. A shaft 3- fastened to the frame connects all the blocks -7-, lmore particularly described herein after, in such a way as to establish` a connection between the rotary movement'of'the trame -Qfand the simultaneousy rotary movement of all the collars In Fig. 2 is representedone of the elements of the transmitting device, said element being designed to transmit the movement of the telescope from a controlling` station -S- to an intermediate station *S1- yIn Fig. 2, -1 representsone of the toothed discs mounted with anreccentricity 0-0 relative to the axis 0-0 of the pivot 0-. The eccentricity 0-0:d is regulated in accordance with the positionot the receiving station and also with the distance of the target observed in the manner set forth hereafter. Upon the disc 1 is fitted a revolving collar 4, carrying a worm 8 and an arm 5 with a forked end 6, within which may slide a block 7 revolving around pivot 3. Said collar acts as an eccentric strap; the worm, which engages the teeth of the disc land is carried by the collar while turning, revolves also bodily around the disc 1, carrying along the collar 4, which acting by means: of the fork 6 and block 7 upon the pivot 3 (fastenedto the frame 2), causes the revolutions of the parts 3, 2 and o-f the sighting telescope around the axis -0-.`

Supposing that the worm turns on its own axis until it has caused the whole system (telescope, pivot 3, frame 2) to revolve around the axis O about an angle a, the co lar 4 will have rotated around the axis O about an angle a', which, by reason ofthe eccentricity 0 O is smaller. than a by the quantity s. There will always exist the relation a-az; and reckoning the angles a clockwisefrom the line w the values of s will be: nought when aio and iup-:180, positive for a:0 180, negative for 112180" 860. It is further obvious that while the telescope, together with the frame 2 and the pivot 3 rotates about theV angle a, the worm 8 will have completed a number of revolutions in proportion to 1r-Lcd. In the case of gun sighting or of the control of searchlights, the corrective angle is a function of the parallax dueA to the distance inte-rvening betwen the transmitting and the re c'eiving stations. y

The parallax however depends not only on the value of the rotation angle of the telescope, i. e., the bearing of the target, but also on its actual distance. Therefore the correction angle must vary both with the direction of the sighting telescope and the distance of the target.

1n order to obtain this result it will suffice to render the eccentricity, o', o variable in function of the distance. For such purpose there is provided in the disc 1 (Fig. 2) an inclined opening 9 into which slides a rod 10 fastened to a vertical rod 11, co-ntrolled by a cam 12.

W ith this arrangement, assuming that the rotation of the cam 12 around its own axis 18 is a function of the distance of the target observed, by conveniently shaping the cam, it will be always possible to obtain, that by the axial displacement of the rod 11, the eccentricity O 0 of disc 1, be brought to the exact value giving the correction of the parallax.

By putting' together several elements as vafore described in each one of which the rod 10 has a convenient inclination, it is slear that 1n every disc may be obtained a and consequently l l 2 through shaft 3 so that by rotating the Y crank 15, the frame 2 will be turned to train the telescope on the target, and the amount ofl rotation of each worm 8 Vdepends on the eccentricity ofits disc with respect to the pivot of frame 2, gears 14 thus being turned i different amount to properly train theguns or searchlights. ,A 'l

By rotating the crank 15, through wheels 16 and 17 (carryingthe satellitepinion 18) the movement is transmitted tothe differs ential 18-19-20 andtherefore to thevaxles 23 and 24, which carry the pinions 21 and 22; these, through Ytheir respective differentials, cause to revolve the pinions of Y screws 25, 26, 27 and 28. Y l

It will be apparent that while the pinion 25, 26, 27, 28 rotate their corresponding worms8 about angles which have a constant ratio to the number of, revolutionsof the crank 15 and while the worms 8, in their turn, each rotate around 'the corresponding discs 1 through the same angle, `due to the eccentricity of thefcollars 4, the-values of the angle in the four elements will be different as explained above, according to the different values which have been assigned to the eccentricity a by suitably rotating the cam 12.

The worms are connected with the driving pinions on one side and withV the transmitting organs on the other, by-means o-f join-ts 14, Vwhich allow the'worms themselves to slightly oscillate around pivot 8.

As it may be seen in this way is obtaine that a single movement of rotation inrpressed to a common controlling organ is transmitted at the same time, to a plurality of stations, which may be in any number whatsoever, each one receiving the angle modified with thecorrection pertaining to it.

I claim as my invention: 1. In a transmission device/comprising a Asingle driving shaft, aV plurality of driven shafts and a group of differential gears linterposed between the said driving shaft and the said driven shafts, means adapted to determine during operation the continuons variation oi the speed ratios between the said driven shafts and the said driving shaft, and between the said driven shafts relative to each other, the said means for determining the variation of the speed ratios comprising eccentrics of variable eccentricity and having their collars connected with the shafts to be driven by the said driving shaft, the arrangement being such as to enable the speed of all the said driven shafts, except one, to be reduced to zero.

i transmission device as Specified in claim l, including means for sharing among the driven shafts the total number of revolutions imparted to them by the driving shaft.

ln testimony whereof l have afiixed my signature in the presence of two Witnesses, this 8th day oi April7 1920.

RICCARDO GlR-RDELLI. Witnesses:

GIOVANNI GIRARDELM, LETTUNI LABsAE'r'ro. 

